Hi, I have a problem. You see, I have built this RC Car using my Arduino Yun. I bought two DC Motors from Adafruit that can go up to 12V, so I have been supplying the both of them with 1 battery through the Seeed Motor Shield v2. The battery is a 7.4v 2S 20C 800mAh. The problem is, the wheels(motors) are turning all fine, and quite fast (maximum speed, for the motor shield I think), but when I set the RC Car on the ground, it just barely moves forward. This is my first extensive project with Arduino so I really want to get it working! Any help would be great! If it helps, I also am powering the Yun with a JHUB portable charger.
EDIT: The connection to the motors is male to female wire not soldered and the male wires are short so they are hard to put in. Should I solder that connection or is it something else?
Links:
Seeed Motor Shield v2
Arduino Yun
DC Motors
Battery (Motors Power Source)
JHUB Portable Charger (Yun Power Source)
do you have a multimeter?
It hasn't been working but I'll give it a try also if you didn't notice my edit the battery is 2S 20 cell not 2 cell if that helps I'll solder some connections and then measure the voltage. Should I measure the voltage coming from the direct battery into the power source for the motors on the seeed shield or should I measure the voltage going to the a single motor?
Hi,
Can you post a picture of your RC project.
If you have just put tires on the shaft of the motors, then you will not have anywhere enough torque to drive the car along the ground.
Unloaded off the ground, the motor isn't driving anything, so runs near full speed.
When you put it on the floor, it has no power to drive, it isn't strong enough.
Tom...... 
Yeah sure I'll do that and admittedly I hot glued the wheels on although they seem firmly attached. I'll solder some connections and then take a picture
Not enough torque. Get gearmotors.
Isaac96:
Not enough torque. Get gearmotors.
That's what I thought too its just that I have other RC cars i had as a kid and they weigh around the same as my RC car which weighs 13.5 oz so I'll look into it. Also what should I do if the motors are hot? Does that mean too much of the power is being given off as heat and not motion energy?
EDIT: I originally said 13.5 grams sorry I meant 13.5 ounces.
TomGeorge:
Hi,
Can you post a picture of your RC project.
If you have just put tires on the shaft of the motors, then you will not have anywhere enough torque to drive the car along the ground.
Unloaded off the ground, the motor isn't driving anything, so runs near full speed.
When you put it on the floor, it has no power to drive, it isn't strong enough.
Tom......
Here are the pictures:
RC Car
Front Wheels/Axel
Back Wheels/Motors
Wiring
Here's the video of the motors spinning:
Wheels Spinning
You can laugh as much as you want it's my first RC car as it's no miracle :). I'm going to run some tests to see if the motors can push something with barely any weight and eventually I'll make a v2 of it with a thinner frame and maybe some better motors. Unless there's something I'm missing, hence why I'm posting this.
You ABSOLUTELY need gearmotors. Polulu has some nice 100:1 ones that are pretty small. https://www.pololu.com/product/1101
